Door mat having an alternating block pattern



FIG. 1 is a top view of a door mat having an alternating block pattern, showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is an enlarged fragmentary perspective top view thereof;

FIG. 4 is an enlarged fragmentary perspective bottom view thereof;

FIG. 5 is a sectional view thereof taken in the direction of the arrows upon the line 5—5 of FIG. 1; and,

FIG. 6 is a side view thereof, the unshown opposite side being of identical appearance. 

The ornamental design for a door mat having an alternating block pattern, as shown and described. 